The application of finite element method in torsion calculating of deep hole drill is introduced.
介绍了有限元法在深孔钻头扭转计算中的应用。
The processing method for inside whorl of middle and small hole is introduced.
介绍了中小孔径内螺纹的加工方法。
The small hole that whelk leaves, what method is treated?
青春痘留下的小坑，有什么办法治疗吗？
The support method of cutting hole in Dongrong No.
介绍了东荣三矿切眼支护方式。
Cement bond logging is a conventional method to check cement bond quality in cased hole.
声波水泥胶结测井是检查套管井固井质量的常规方法。
The design method of the key components of new jet type down-hole supercharger is analyzed.
探讨了新型射流式井下增压装置的射流元件、组合阀、增压缸体和外缸体等关键部件的设计问题。
The design method of the key components of new jet type down-hole supercharger is analyzed.
探讨了新型射流式井下增压装置的射流元件、组合阀、增压缸体和外缸体等关键部件的设计问题。
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